To form reported speech in Russian, you generally need to change the introductory verb (говорить/сказать) and adjust the tense of the verb in the reported speech. Here is how you can change a direct statement into reported speech:
Direct statement: "Мама говорит: 'Я приготовлю вкусный ужин'." Reported speech: Мама сказала, что она приготовит вкусный ужин.
In reported speech, the verb 'приготовлю' changed to 'приготовит' to match the context of the reported statement. Remember to adjust the pronouns and tenses accordingly to correctly convey the original message.
